title: [Photoperiodic variations in plasma concentration of testosterone in the rabbit].
abstract: The photoperiodic variations of testosterone plasmatic levels in male rabbits have been studied. The animals were subjected to the influence of three circadian rhythms: 12/12, 14/10 and 10/14 h of light/darkness. The hormone assay was carried out using an enzymeimmunoassay method (Competitive ELISA). Blood samples were of two different types: seriated and non-seriated, to find if these might be any differences in the results. It is concluded that testosterone plasmatic levels are within physiologic values (0.3-10.0 ng/ml), although differences depending on the light/darkness cycle and on the type of blood extraction are remarkable; for this reason the selection of the circadian rhythm will depend on the experimentation that is to be carried out.
authors.affiliation: Departamento de Fisiología animal, Facultad de Veterinaria, U.C.M., Madrid, España.
authors.forename: G
authors.initials: G
authors.lastname: Silván
authors.forename: J C
authors.initials: JC
authors.lastname: Illera
authors.forename: J
authors.initials: J
authors.lastname: Martín
authors.forename: R
authors.initials: R
authors.lastname: Manjón
authors.forename: M
authors.initials: M
authors.lastname: Illera
mesh_terms: D000818:Animals; D002940:Circadian Rhythm / Q000502:physiology*; D004797:Enzyme-Linked Immunosorbent Assay; D008297:Male; D011817:Rabbits; D013739:Testosterone / Q000097:blood*
chemical_list: D013739:Testosterone
vernacular_title: Variaciones fotoperiódicas de las concentraciones plasmáticas de testosterona en conejo.